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I have a Hyper-V VM running in Windows Server 2016 that is being managed through System Center. The VM has a device connected via DDA; therefore, the VM cannot enter the save state. This means that attempts to place the host in Maintenance Mode will fail.

Is there a way I can intercept a request for maintenance mode so I can send a signal to the guest OS? Furthermore, can I postpone the maintenance mode to give the guest time to react?

My current workaround is to manually signal the guest OS, then enter maintenance mode via the Disable-SCVMHost cmdlet, but I would prefer to do it from System Center.

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    I assume that System Center you mentioned is System Center Virtual Machine Manager exactly. If so, I think there are two methods: 1. In VMM Console, manually shut down VM before staring maintenance mode, and then perform maintenance mode from VMM console. 2. Develop console add-in in VMM, the add-in can perform signal VM, and then start maintenance mode. 3. develop a Powershell script, which has the same function as console add-in.
    – Andy Liu - MSFT
    Apr 27, 2017 at 9:35
  • @AndyLiu-MSFT yes, I was referring to the VMM. I will look into developing a console add-in.
    – Drew McGowen
    May 1, 2017 at 14:25
  • You can find the guide and examples for VMM add-in SDK from the link below. msdn.microsoft.com/en-us/library/…
    – Andy Liu - MSFT
    May 3, 2017 at 8:42

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If you've passed through a PCI device to the guest, the VM can't really move to another host. And as long as that is true, why are you marking it as a cluster resource? Just make it an unclustered VM and then the cluster service won't track it, and you'll be able to put the host in maintenance mode.

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  • I believe we're using System Center to allow for additional features not present in i.e. the Hyper-V Manager.
    – Drew McGowen
    May 1, 2017 at 15:46

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